Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e349be9f526c2e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 06:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c48f36b94b6bb92d76b40a5d3d158f73 SHA-1: 3b4d65bedb93e746081931ca8087d9c4c9ec773e SHA-256: 67e349be9f526c2e2d7793d13417494d42a7274db78d408e8184ac620fd6b3b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://teenmag.cz/userfiles/file/16005754849.pdf In PDF document text
    • https://frisch.ro/files/file/fevibolilufufetokamox.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/koxuzumusonubuve.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/49511046110.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/77765221880.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/39053177626.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/6965274940.pdfIn PDF document text
    • http://chinalabware.net/d/files/57252907951.pdfIn PDF document text
    • https://guijek.com/userfiles/file/10291644351.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f205dc3f---nejoju.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/dunidapigodukavunizek.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/tusawedoxisutikis.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613835bc8b7e4---xuxubonazewawefogazadeje.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/xewefazawilogaxed.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6248f7af3a8e61bca1793172c93f10cd/ritesosadaxa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135435875c76---38007123870.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/11306497478.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cca9878eb---13094629921.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ke384e8nglo8bcgvuga2ebs449/peluweserajugaw.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/63823581631.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/81638802555.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/vamowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=purevpn+premium+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 10500 bytes
SHA-256: 32faccf72c22c41bb41f7bae2c21e505672fdecdd068e18082caac9480c0f0bf
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 17732 bytes
SHA-256: 21c8d483e728f1afaadcc3bfbfd7fb9fdf867b54ae21f355579324bafac1528f